If you said I am confused about Oracle that's ok b/c I think I misinterpretted what I want to say.

I do have TEST user on Management server and I also have TEST user in the database with SYSDBA, SYSOPER granted to TEST.

on the management server, I logged as TEST and when I need to connect to the database of course I need to log in as the user which exists on the database which is also TEST in my case, but the problem is I can't shutdown nor startup the database.